US20100007429A1 - Printed circuit board - Google Patents
Printed circuit board Download PDFInfo
- Publication number
- US20100007429A1 US20100007429A1 US12/205,146 US20514608A US2010007429A1 US 20100007429 A1 US20100007429 A1 US 20100007429A1 US 20514608 A US20514608 A US 20514608A US 2010007429 A1 US2010007429 A1 US 2010007429A1
- Authority
- US
- United States
- Prior art keywords
- area
- differential pairs
- circuit board
- printed circuit
- differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0275—Fibers and reinforcement materials
- H05K2201/029—Woven fibrous reinforcement or textile
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09236—Parallel layout
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09263—Meander
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09272—Layout details of angles or corners
Abstract
A printed circuit board includes a plurality of differential pairs arranged thereon side-by-side. Each differential pair includes two transmission lines. Each transmission line includes a plurality of sections of equal length. Every two adjacent sections in each transmission line meet at an angle, and all angles are equal. The length of each section is determined by dividing the distance between two corresponding angles of the two transmission lines of each differential pair by the cosine of half of the angle.
Description
- 1. Field of the Invention
- The present invention relates to a printed circuit board and a method for routing the printed circuit board.
- 2. Description of the Related Art
- A printed circuit board (PCB) needs an insulating base material to avoid shorting circuits on the PCB. The insulating material must be strong enough to protect copper tracks placed upon it. A widely used PCB base material is glass fabric, which absorbs little moisture, has great strength and stiffness, and is highly flame-resistant. However, glass fabric has a low transmission quality of differential signals transmitted on the PCB caused by gaps between the thin fiber strips of the glass fabric.
- What is needed, therefore, is a PCB to overcome the above-described shortcoming.
-
FIG. 1 is a schematic view of an embodiment of a PCB, the PCB including a plurality of differential pairs. -
FIG. 2 is an enlarged view of the differential pairs of the PCB ofFIG. 1 . -
FIG. 3 is a flowchart illustrating a method for routing the PCB ofFIG. 1 . - Referring to
FIG. 1 , an embodiment of a printed circuit board includes afirst area 10, asecond area 20, athird area 30 located between the first and second area, and a plurality ofdifferential pairs 40 arranged in thethird area 30 side-by-side. The first andsecond areas differential pairs 40. Thethird area 30 is a routing area formed by a first straight line (not labeled) and a second straight line (not labeled). The first straight line and thefirst area 10 intersect at a point. The second straight line is superposed with an inner side of thesecond area 20. - A routing direction of each
differential pair 40 is parallel to the first straight line and the second straight line as shown by an arrow inFIG. 1 . Eachdifferential pair 40 includes two transmission lines. Each transmission line includes a plurality of sections of equal length. Every two adjacent sections in each transmission line meet at an angle θ. The angle θ is between 0° and 180°. All of the angles θ are equal. - Referring also to
FIG. 2 , a maximum number n of the plurality ofdifferential pairs 40 arranged in thethird area 30 are obtained according to equation (1) below: -
n=[(h−y−w+d2)/(d1+d2)] (1) - where:
- h is a shortest distance between the first straight line and the second straight line;
- y is a shortest distance between every two adjacent angles θ of each transmission line determined according to equation (2)
-
y=x*cos(θ/2), (2) - where x is a length of each section;
- w is a width of each transmission line along a direction perpendicular to the routing direction;
- d1 is a distance between the two transmission lines of each
differential pair 40; and - d2 is a distance between every two adjacent
differential pairs 40. - For exemplary purposes only, a sum of a distance between the two transmission lines of the differential pair is about 11.5 to about 12 mils, and the width of each transmission line is about 4 to about 5 mils. Without changing these parameters of the differential pair, each transmission line may be bent into a plurality of sections. Therefore, the value of d1 is about 11.5 to about 12 mils, and the value of w is about 4 to about 5 mils. The length of each section may be adjusted to ensure that both of the two transmission lines of each differential pair are located on the glass fiber strips of the base material of the PCB, instead of one transmission line of a differential pair located on a gap between the glass fiber strips, while another transmission line is located on the glass fiber strips.
- A typical width of each gap between the glass fiber strips of a common glass fabric is about 10 to about 20 mils. If the
differential pair 40 is located on the glass fabric, the length x of each section may be adjusted to ensure that the shortest distance between every two adjacent angles θ of each transmission line is greater than or equal to the distance between two corresponding angles of the two transmission lines of each differential pair, and specifically, to ensure that y is greater than or equal to d1. In one embodiment, y may be equal to d1 instead of being greater than d1 to save space within each differential pair. Thus, a total width W of eachdifferential pair 40 in thethird area 30 is about 27 to about 29 mils, according the following equation: -
W=2d1+w - As the width of a gap between the glass fiber strips becomes less than the total width W of each
differential pair 40, and the shortest distance between every two adjacent angles θ of each transmission line becomes substantially equal to the distance between two corresponding angles of the two transmission lines of eachdifferential pair 40, both of the two transmission lines of eachdifferential pair 40 will be located on the glass fiber strips of the base material of the PCB. Noise from the transmission lines of thedifferential pairs 40, caused by gaps between the glass fiber strips of the PCB base material, is avoided. - Referring to
FIG. 3 , is a method for routing the PCB ofFIG. 1 . Depending on the embodiment, certain of the steps described below may be removed, others may be added, and the sequence of steps may be altered. - Step 100: providing a plurality of differential pairs, each differential pair comprises two transmission lines.
- Step 200: bending each transmission line into a plurality of sections, every two adjacent sections of each transmission line meets at a substantially equal angle.
- Step 300: arranging the plurality of differential pairs in the routing area of the PCB side-by-side.
- Step 400: determining a length of each section by dividing the distance between two corresponding angles of the two transmission lines of each differential pair by the cosine of half of the angle.
- The embodiments are chosen and described in order to explain the principles of the invention and their practical application so as to enable others skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its spirit and scope. Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.
Claims (5)
1. A printed circuit board comprising a plurality of differential pairs arranged thereon side-by-side;
wherein each differential pair comprises two transmission lines, each transmission line comprises a plurality of sections of equal length, every two adjacent sections of each transmission line meet at a substantially equal angle, and the length of each section is determined by dividing the distance between two corresponding angles of the two transmission lines of each differential pair by the cosine of half of the angle.
2. The printed circuit board of claim 1 , further comprising:
a first area being not in communication with the plurality of differential pairs;
a second area being not in communication with the plurality of differential pairs; and
a routing area positioned between the first area and the second area, wherein the plurality of differential pairs are arranged in the routing area.
3. The printed circuit board of claim 2 , wherein the routing area is formed by a first straight line and a second straight line running parallel to the routing directions of the differential pairs, the first straight line meets an inner side of the first area at an intersection, the second straight line is superposed with an inner side of the second area.
4. A method for routing a printed circuit board, the method comprising:
providing a plurality of differential pairs, each differential pair comprises two transmission lines;
bending each transmission line into a plurality of sections, every two adjacent sections of each transmission line meets at a substantially equal angle;
arranging the plurality of differential pairs on the printed circuit board side-by-side;
determining a length of each section by dividing the distance between two corresponding angles of the two transmission lines of each differential pair by the cosine of half of the angle.
5. The method of claim 4 , further comprising forming a routing area by a first straight line and a second straight line running parallel to a routing direction of the differential pairs, wherein the differential pairs are arranged in the routing area.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200810302663.3 | 2008-07-08 | ||
CN2008103026633A CN101626658B (en) | 2008-07-08 | 2008-07-08 | Printed circuit board |
CN200810302663 | 2008-07-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100007429A1 true US20100007429A1 (en) | 2010-01-14 |
US8018296B2 US8018296B2 (en) | 2011-09-13 |
Family
ID=41504630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/205,146 Expired - Fee Related US8018296B2 (en) | 2008-07-08 | 2008-09-05 | Printed circuit board having a plurality of angled differential pairs of transmission lines |
Country Status (2)
Country | Link |
---|---|
US (1) | US8018296B2 (en) |
CN (1) | CN101626658B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150370954A1 (en) * | 2014-06-19 | 2015-12-24 | Cisco Technology, Inc. | Triangular routing for high speed differential pair length matching |
US20180337745A1 (en) * | 2014-03-03 | 2018-11-22 | Inphi Corporation | Optical module |
US10813211B2 (en) * | 2018-12-14 | 2020-10-20 | Dell Products L.P. | Printed circuit board layout for mitigating near-end crosstalk |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102487573A (en) * | 2010-12-03 | 2012-06-06 | 鸿富锦精密工业(深圳)有限公司 | Printed circuit board |
TW201228492A (en) * | 2010-12-17 | 2012-07-01 | Hon Hai Prec Ind Co Ltd | Printed circuit board |
CN102548187B (en) * | 2010-12-20 | 2016-02-10 | 鸿富锦精密工业(深圳)有限公司 | Printed circuit board (PCB) |
CN105636342B (en) * | 2016-01-01 | 2019-07-12 | 广州兴森快捷电路科技有限公司 | A kind of wire laying mode of printed circuit board |
US20180132344A1 (en) * | 2016-11-09 | 2018-05-10 | Dell Products, Lp | System and Method of Crosstalk Mitigation in Microstrip Serial Links in a Printed Circuit Board |
CN114357932B (en) * | 2021-11-19 | 2023-11-03 | 苏州浪潮智能科技有限公司 | Signal line wiring method, device, equipment and readable storage medium |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414393A (en) * | 1992-08-20 | 1995-05-09 | Hubbell Incorporated | Telecommunication connector with feedback |
US6573801B1 (en) * | 2000-11-15 | 2003-06-03 | Intel Corporation | Electromagnetic coupler |
US6576847B2 (en) * | 1999-05-25 | 2003-06-10 | Intel Corporation | Clamp to secure carrier to device for electromagnetic coupler |
US20040239438A1 (en) * | 2003-05-30 | 2004-12-02 | Benham John R. | Compact electromagnetic coupler for use with digital transmission systems |
US20070159271A1 (en) * | 2004-03-09 | 2007-07-12 | Dan Kuylenstierna | Tuneable delay line |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1486640A (en) | 2003-09-16 | 2004-04-07 | 徐阳志 | Compound isatis root beverage |
US7375979B2 (en) * | 2005-03-25 | 2008-05-20 | Motorola, Inc. | Method and apparatus for routing a differential pair on a printed circuit board |
-
2008
- 2008-07-08 CN CN2008103026633A patent/CN101626658B/en not_active Expired - Fee Related
- 2008-09-05 US US12/205,146 patent/US8018296B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414393A (en) * | 1992-08-20 | 1995-05-09 | Hubbell Incorporated | Telecommunication connector with feedback |
US6576847B2 (en) * | 1999-05-25 | 2003-06-10 | Intel Corporation | Clamp to secure carrier to device for electromagnetic coupler |
US6573801B1 (en) * | 2000-11-15 | 2003-06-03 | Intel Corporation | Electromagnetic coupler |
US6611181B2 (en) * | 2000-11-15 | 2003-08-26 | Intel Corporation | Electromagnetic coupler circuit board having at least one angled conductive trace |
US20040239438A1 (en) * | 2003-05-30 | 2004-12-02 | Benham John R. | Compact electromagnetic coupler for use with digital transmission systems |
US20070159271A1 (en) * | 2004-03-09 | 2007-07-12 | Dan Kuylenstierna | Tuneable delay line |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180337745A1 (en) * | 2014-03-03 | 2018-11-22 | Inphi Corporation | Optical module |
US20150370954A1 (en) * | 2014-06-19 | 2015-12-24 | Cisco Technology, Inc. | Triangular routing for high speed differential pair length matching |
US9690895B2 (en) * | 2014-06-19 | 2017-06-27 | Cisco Technology, Inc. | Triangular routing for high speed differential pair length matching |
US10325053B2 (en) * | 2014-06-19 | 2019-06-18 | Cisco Technology, Inc. | Triangular routing for high speed differential pair length matching |
US10813211B2 (en) * | 2018-12-14 | 2020-10-20 | Dell Products L.P. | Printed circuit board layout for mitigating near-end crosstalk |
Also Published As
Publication number | Publication date |
---|---|
CN101626658A (en) | 2010-01-13 |
CN101626658B (en) | 2011-12-21 |
US8018296B2 (en) | 2011-09-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HON HAI PRECISION INDUSTRY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LI, CHENG-SHIEN;CHEN, YUNG-CHIEH;HSU, SHOU-KUO;REEL/FRAME:021488/0048 Effective date: 20080828 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.) |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20150913 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |